How much of the world's cadmium disease burden comes from food versus cigarettes?

What's actually in it

Cadmium is a toxic heavy metal you're exposed to through two main routes: food and cigarette smoke. Dietary cadmium comes from rice, leafy greens, root vegetables, shellfish, and whole grains that absorb it from contaminated soil. A single cigarette delivers about 1 to 2 micrograms of cadmium directly to the lungs.

For non-smokers, food is responsible for nearly 100% of cadmium intake.

What the research says

A 2026 global burden analysis in Environ Int estimated the worldwide health impact of cadmium from both dietary and cigarette sources. The analysis calculated how many cases of kidney disease, lung cancer, and bone disease are attributable to cadmium exposure.

Dietary cadmium was the dominant source for the general population, contributing to chronic kidney disease in millions of people worldwide. Rice-eating populations in Asia faced the highest dietary exposure. Cigarette cadmium added extra risk for lung cancer and kidney damage in smokers.

The analysis found that even modest dietary cadmium reduction, replacing some rice with lower-cadmium grains, could prevent a meaningful number of kidney disease cases globally.

Diversify your grain intake by rotating between rice, oats, quinoa, and millet. Cook rice with extra water and drain it to reduce cadmium by up to 50%. Eat root vegetables from varied sources rather than relying on one farm or region. If you smoke, quitting eliminates the second-largest cadmium source.